<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />

    <el-tree
      ref="tree2"
      :data="data2"
      :props="defaultProps"
      :filter-node-method="filterNode"
      :expand-on-click-node="false"
      class="filter-tree"
      default-expand-all
    >
      <span slot-scope="{ node, data }" class="custom-tree-node">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            type="primary"
            size="mini"
            class = "operate-button"
            @click="append(data)">
            新增
          </el-button>
          <el-button
            type="primary"
            size="mini"
            class = "operate-button"
            @click="append(data)">
            修改
          </el-button>
          <el-button
            type="danger"
            size="mini"
            class = "operate-button"
            @click="remove(node, data)">
            删除
          </el-button>
        </span>
      </span>
    </el-tree>

  </div>
</template>

<script>
let id = 100
export default {
  data() {
    return {
      filterText: '',
      data2: [{
        id: 1,
        label: 'Level one 1',
        children: [{
          id: 4,
          label: 'Level two 1-1',
          children: [{
            id: 9,
            label: 'Level three 1-1-1'
          }, {
            id: 10,
            label: 'Level three 1-1-2'
          }]
        }]
      }, {
        id: 2,
        label: 'Level one 2',
        children: [{
          id: 5,
          label: 'Level two 2-1'
        }, {
          id: 6,
          label: 'Level two 2-2'
        }]
      }, {
        id: 3,
        label: 'Level one 3',
        children: [{
          id: 7,
          label: 'Level two 3-1'
        }, {
          id: 8,
          label: 'Level two 3-2'
        }]
      }],
      defaultProps: {
        children: 'children',
        label: 'label'
      }
    }
  },
  watch: {
    filterText(val) {
      this.$refs.tree2.filter(val)
    }
  },

  methods: {
    filterNode(value, data) {
      if (!value) return true
      return data.label.indexOf(value) !== -1
    },
    append(data) {
      const newChild = { id: id++, label: 'testtest', children: [] }
      if (!data.children) {
        this.$set(data, 'children', [])
      }
      data.children.push(newChild)
    },

    remove(node, data) {
      console.log(node)
      const parent = node.parent
      const children = parent.data.children || parent.data
      const index = children.findIndex(d => d.id === data.id)
      console.log(index)
      children.splice(index, 1)
    }
  }
}
</script>
<style>
  .custom-tree-node {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    padding-right: 8px;
  }
  .operate-button{
    padding: 4px 12px;
  }
</style>

